CN106357377B - Full-duplex half-duplex hybrid relay implementation method based on diversity gain - Google Patents

Full-duplex half-duplex hybrid relay implementation method based on diversity gain Download PDF

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CN106357377B
CN106357377B CN201610778493.0A CN201610778493A CN106357377B CN 106357377 B CN106357377 B CN 106357377B CN 201610778493 A CN201610778493 A CN 201610778493A CN 106357377 B CN106357377 B CN 106357377B
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duplex
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CN106357377A (en
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李成
夏斌
陈智勇
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Shanghai Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/60—Supervising unattended repeaters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Abstract

The invention provides a full-duplex half-duplex hybrid relay implementation method based on diversity gain, which comprises the following steps of 1: estimating channel state information; step 2: selecting a transceiving mode of an antenna; and step 3: calculating the signal-to-interference-and-noise ratios of different links according to the obtained parameters; and 4, step 4: calculating the signal-to-interference-and-noise ratio under the full-duplex mode amplification forwarding protocol and the decoding forwarding protocol; and 5: calculating system capacity in full duplex mode; step 6: calculating a link signal-to-interference ratio in a half-duplex mode according to the estimated channel state information; and 7: calculating the system signal-to-interference-and-noise ratio under the amplifying forwarding protocol and the decoding forwarding protocol in the half-duplex mode; and 8: calculating the reachable capacity in the half-duplex mode; and step 9: the best mode of operation is selected based on instantaneous spectral efficiency. The invention can utilize all hardware resources to realize the improvement of performance, namely, the maximization of the transmission rate from the source node to the destination node.

Description

Full-duplex half-duplex hybrid relay implementation method based on diversity gain
Technical Field
The invention relates to the technical field of wireless communication, in particular to a full-duplex half-duplex hybrid relay implementation method based on diversity gain.
Background
The Full Duplex (Full Duplex) technology is a technology that enables uplink and downlink of communication devices such as mobile terminals, base stations, wireless access points, and the like to work in the same frequency band and the same time period. Currently, all known communication systems operate in a Half Duplex (Half Duplex) state, i.e. the uplink and the downlink operate in different frequency bands or different Time periods, such as a Time Division Duplex (TDD) system and a Frequency Division Duplex (FDD) system. Full-duplex technology has twice the spectral efficiency of a corresponding half-duplex system compared to half-duplex, and therefore has received extensive attention and research. On the other hand, self-interference (self interference) caused by the full-duplex technology severely limits the performance of the system because the uplink and the downlink work in the same frequency band and the same time period and the interference generated by the transmitting end to the receiving end. With the rapid development of integrated electronics, self-interference introduced by full-duplex can be effectively suppressed to a level that is only a few dB higher than noise by the estimation of the self-interference channel and the cancellation of the known signal. This adds new power to the full duplex practical application.
However, it is not negligible that although the full-duplex interference can be effectively eliminated, there is still residual self-interference (RSI) several dB higher than the noise after the elimination, and once the self-interference elimination capability of the communication device is insufficient, there will be strong residual self-interference. When the intensity of the residual self-interference reaches a certain value, the system gain brought by the full-duplex mode is seriously eroded, and even the efficiency is not as good as that of the half-duplex mode. When this occurs, operating directly in half-duplex mode can provide superior system performance. Therefore, in a practical system, a hybrid duplex mode, i.e., full duplex/half duplex adaptive technology, can effectively overcome the influence of self-interference introduced by full duplex on system performance while providing higher spectral efficiency compared with full duplex and half duplex. When the system actually working in the full-duplex mode is still influenced by the larger residual self-interference after the self-interference is eliminated, the system can be switched to the half-duplex mode, so that the influence of the self-interference can be completely eliminated, and the frequency spectrum efficiency is not influenced by the larger residual self-interference.
Full-duplex technology is generally implemented by two antennas, one antenna receiving a signal and the other antenna transmitting a signal. When the system works in a full duplex state, the system can only utilize one antenna for receiving and transmitting signals. In the conventional full duplex technology, both the receiving antenna and the transmitting antenna are preset. In addition, in the conventional hybrid duplex technology, only one antenna is still used to receive or transmit signals after the system is switched to the half-duplex mode. These two modes of operation contribute to a portion of the antenna diversity gain being lost. Aiming at the problem, a full-duplex antenna self-adaptive technology and a full-duplex and half-duplex mixed duplex technology are provided. By utilizing the technology, the antenna diversity gain can be effectively utilized, and the improvement of the system performance is realized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a full-duplex half-duplex hybrid relay implementation method based on diversity gain.
The method for realizing full-duplex half-duplex hybrid relay based on diversity gain provided by the invention comprises the following steps:
step 1: estimating channel state information;
step 2: selecting a receiving and transmitting mode of an antenna according to an antenna selection mechanism;
and step 3: calculating the signal-to-interference-and-noise ratios of different links according to the obtained parameters;
and 4, step 4: calculating the system signal-to-interference-and-noise ratio under the full-duplex mode amplification forwarding protocol and the decoding forwarding protocol;
and 5: calculating System Capacity C in full Duplex modefd；
Step 6: calculating link signal-to-interference ratio in a half-duplex mode when maximum ratio combining MRC and maximum ratio transmission MRT technologies work according to estimated channel state information;
and 7: calculating system signal-to-interference-and-noise ratio gamma under amplifying forwarding protocol and decoding forwarding protocol in half-duplex modeHD；
And 8: calculating achievable capacity C in half-duplex modeHD；
And step 9: the best mode of operation is selected based on instantaneous spectral efficiency.
Preferably, the step 1 comprises: estimate h1,1，h1,2，h2,1，h2,2，hsiAnd the intensity of the noise σ2Wherein: h is1,1，h1,2，h2,1，h2,2Respectively representing a channel coefficient from a source node S to an antenna Ant-1 of a relay node R, a channel coefficient from the source node S to an antenna Ant-2 of the relay node R, a channel coefficient from the antenna Ant-1 of the relay node R to a destination node, and a channel coefficient from the antenna Ant-2 of the relay node R to the destination node; at the same time, the source node S sends its own system parameter P by using the control channelSThe relay node R sends the system parameter P of the relay node R to the relay nodeRTo the destination node.
Preferably, the step 2 includes: the relay node obtains h according to the known informationmin,1＝min{h1,1,h2,2}，hmin,2＝min{h1,2,h2,1And compare | hmin,1I and | hmin,2The size of |;
when | hmin,1|≤|hmin,2Sending a signal by adopting Ant-1 in a full duplex mode, and receiving the signal by Ant-2; when | hmin,1|≥|hmin,2An antenna Ant-1 is adopted to receive signals in |, and Ant-2 sends signals; i.e. | hmin,1|＝|hmin,2If | this is the case, the transmission/reception mode of the antenna can be arbitrarily selected.
Preferably, the formula for calculating the signal to interference plus noise ratios of the different links in step 3 is as follows:
Figure BDA0001102224330000031
γs,d＝PS|hsd|2/σ2
in the formula: gamma rayf,rRepresenting the signal-to-interference-and-noise ratio, k, of the channel between the relay node and the source node in full duplex modeRRepresents the self-interference elimination capability of the full-duplex relay node, sigma represents the standard deviation of Gaussian noise suffered by the system, and gamma represents the self-interference elimination capability of the full-duplex relay nodef,dRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the relay node and the destination node in full duplex modes,dRepresenting the signal-to-interference-and-noise ratio, h, of the channel between the source node and the destination nodesdRepresenting the channel coefficient between a source node and a destination node of the system; h is1Representing the channel coefficient, h, between the source node S and the relay node after the full-duplex transceiving antenna is selected2Representing the channel coefficient between the relay node R and the destination node D after the full-duplex transceiving antenna is selected.
Preferably, the calculation formula of the system signal to interference plus noise ratio under the full duplex mode amplification forwarding protocol and the decoding forwarding protocol in step 4 is as follows:
Figure BDA0001102224330000032
in the formula: gamma rayFDThe signal-to-noise ratio of the system under the full-duplex mode amplification forwarding protocol and the decoding forwarding protocol is shown, AF represents the amplification forwarding protocol, and DF represents the decoding forwarding protocol.
Preferably, the system capacity C in said step 5fdThe calculation formula of (a) is as follows:
Cfd＝log2(1+γFD)。
preferably, the calculation formula of the link signal-to-interference ratio in the half-duplex mode in step 6 is as follows:
Figure BDA0001102224330000033
γs,d＝PS|hsd|2/σ2
in the formula: gamma rayh,rRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the source node and the relay node in half-duplex modeh,dRepresenting the signal-to-interference-and-noise ratio, h, of the channel between the relay node and the destination node in half-duplex modesdRepresenting the channel coefficients between the source node S and the destination node.
Preferably, the system signal to interference plus noise ratio γ in step 7HDThe calculation formula of (a) is as follows:
Figure BDA0001102224330000041
preferably, the reachable capacity C in half-duplex mode in step 8 isHDThe calculation formula of (a) is as follows:
Figure BDA0001102224330000042
preferably, the step 9 comprises: the best mode of operation is selected based on instantaneous spectral efficiency,
specifically, the method comprises the following steps: when C is presentFD＞CHDWhen the relay node works in the full duplex mode, the relay node works in the full duplex mode; when C is presentFD＜CHDWhen the relay node works in the half-duplex mode, the relay node works in the half-duplex mode; when C is presentFD＝CHDAnd when the relay node works in the full-duplex mode or the half-duplex mode, the relay node selects to work in the full-duplex mode or the half-duplex mode.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a novel hybrid duplex mechanism based on an actual communication system, and in the mechanism, system hardware resources can be fully utilized to provide diversity gain.
2. Since in a full-duplex system the performance gain due to full-duplex is limited by the residual self-interference, the system goes to half-duplex mode when the residual self-interference is too strong. The lower performance bound of a hybrid duplex system can be said to be system performance in half duplex mode. In the hybrid duplex mechanism provided by the invention, the relay can utilize the characteristic of multiple antennas, so that the system performance in a half-duplex mode is improved. Therefore, the performance of the hybrid duplex system provided by the invention is obviously improved compared with the traditional duplex technology.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of a conventional channel estimation principle;
FIG. 2 is a model of a system operating in full duplex mode;
FIG. 3 is a system model operating in half-duplex mode during sub-slot 1;
FIG. 4 is a model of a system operating in half-duplex mode during sub-slot 2;
fig. 5 is a schematic diagram of a full-duplex one-way relay system.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In the existing hybrid duplex relay mechanism based on full duplex and half duplex, the instantaneous channel capacity of the system in the full duplex mode and the system in the half duplex mode are calculated according to the estimated system parameters of channel link coefficient, self-interference intensity, noise level, transmitting power and the like. And comparing the instantaneous channel capacities in the two modes, and then selecting the mode with the larger capacity to work. Therefore, full duplex and half duplex modes are fully utilized, and the system capacity is improved.
According to the existing full-duplex half-duplex hybrid relay implementation method, the method comprises the following steps:
step A1: acquiring channel state information, intensity variance of residual self-interference and noise variance of the residual self-interference;
step A2: selecting a receiving and transmitting mode of an antenna according to an antenna selection mechanism;
step A3: calculating the signal-to-noise ratio of the channel according to the channel state information obtained in the step 1;
step A4: calculating the signal-to-interference-and-noise ratio of a link from a source node to a relay node;
step A5: calculating to obtain the signal-to-interference-and-noise ratio of the amplifying forwarding protocol and the decoding forwarding protocol from the source node to the destination node in the full duplex mode;
step A6: calculating the signal-to-interference-and-noise ratio of all antennas in the half-duplex mode and considering the direct transmission link;
step A7: calculating the spectrum efficiency under all modes;
step A8: a full duplex mode or a half duplex mode is selected based on the instantaneous spectral efficiency.
The method comprises the following specific steps:
1) acquiring channel state information h according to existing channel estimation techniquesSR，hSD，hRD，hLIAnd the variance σ of the intensity of residual self-interference and noiseR、σDThe user node S adopts the control channel to send the own system parameter transmitting power P to the relay nodeS；
2) Calculating the signal-to-noise ratio of the channel according to the obtained parameters
Figure BDA0001102224330000051
Figure BDA0001102224330000052
Wherein gamma isLIRepresenting the residual self-interference channel signal-to-noise ratio after interference cancellation.
Figure BDA0001102224330000053
Figure BDA0001102224330000054
Figure BDA0001102224330000055
Figure BDA0001102224330000061
In the formula: gamma raySRRepresenting the variance of the noise, h, over the squared ratio of the modes of the channel coefficients of the source node S to the relay node RSRRepresenting the channel coefficient, gamma, from the source node S to the relay nodeRDRepresenting the variance of the noise, h, over the squared ratio of the modes of the channel coefficients of the relay node R to the destination node DRDRepresenting the channel coefficient, gamma, of the relay node R to the destination node DSDRepresenting the variance of the noise, h, over the square ratio of the channel coefficient modes of the source node S to the destination node DSDRepresenting the channel coefficient, h, from the source node S to the destination node DLIRepresenting the channel coefficient, gamma, between the transmitting antenna and the receiving antenna of a full-duplex nodeLIRepresenting the residual self-interference channel signal-to-noise ratio after interference cancellation,
Figure BDA0001102224330000062
representing the variance in the strength of the interference noise received by the relay node R,
Figure BDA0001102224330000063
to show the eyesNode D of (a) is subject to noise variance.
3) Calculating the signal-to-interference-and-noise ratio of a link from a source node to a relay node;
Figure BDA0001102224330000064
Figure BDA0001102224330000065
in the formula: gamma rayRRepresenting the signal to interference plus noise ratio, gamma, at the relay nodeDRepresenting the signal-to-interference-and-noise ratio, P, of the received signal of the destination nodeRIndicating the transmitted power of the relayed signal, PSRepresenting the transmit power at which the user node S transmits signals.
4) The calculation formula of the signal to interference plus noise ratio from the source node to the destination node of the amplifying forwarding protocol and the decoding forwarding protocol in the full duplex mode is as follows:
Figure BDA0001102224330000066
in the formula: gamma rayFDAnd the effective signal-to-interference-and-noise ratio between the source node S and the destination node in the full duplex mode is represented, AF represents an amplification forwarding protocol, and DF represents a decoding forwarding protocol.
5) The formula for calculating the signal-to-interference-and-noise ratio by using the direct transmission link in the half-duplex mode is as follows:
Figure BDA0001102224330000067
in the formula: gamma rayHD+MRCThe representation takes into account the effective signal to interference and noise ratio of the direct link existing from the source node to the destination node.
6) The formula for calculating the spectral efficiency is as follows:
CFD＝log(1+γFD)
Figure BDA0001102224330000071
in the formula: cFDDenotes the maximum transmission rate, C, that can be achieved per Hz channel bandwidth in full duplex modeHD+MRCWhich represents the maximum transmission rate that can be achieved per hertz of channel bandwidth in half-duplex mode and taking into account the direct link between the source node and the destination node.
7) When C is presentFD＞CHD+MRCWhen the system works in a full duplex mode;
when C is presentFD＜CHD+MRCAt the time, the system operates in half-duplex mode.
In the above system, it is assumed that the relay node is provided with two antennas to implement the full duplex mode, and which antenna is used for receiving information and which antenna is used for transmitting information are preset. Therefore, when the relay node operates in half-duplex, only one antenna can be used to receive information, and the other antenna can be used to transmit information. This results in a lack of spectral efficiency. Because the relay node is provided with two antennas, the two antennas can be considered to be used for receiving and sending information when the system works in half duplex.
In the full-duplex relay system, eliminate the influence that remains self-interference and bring, the transmission rate of maximize system can be realized through two kinds of modes: firstly, the full-duplex self-interference elimination capability is improved; and the second is to adopt a hybrid duplex mechanism. After the self-interference elimination capability of the node is fixed, the system performance can be improved by adopting a hybrid duplex mechanism. In combination with the characteristic that the full-duplex mode requires at least two antennas to realize simultaneous same-frequency transmission, it can be considered that all the antennas are utilized to perform orthogonal reception and transmission when the full-duplex instantaneous residual self-interference is high and the system is switched to the half-duplex mode. Therefore, all hardware resources are utilized to realize the improvement of performance, namely the maximization of the transmission rate from the source node to the destination node is realized.
Fig. 1 is a model of a system operating in full-duplex mode, and fig. 2 is a model of a system operating in half-duplex mode. The system is assumed to be composed of a source node S, a relay node R and a destination node D. A direct transmission link exists between the source node S and the destination node D, and information can only be transmitted through the relay node. It is assumed that the source node S is equipped with one antenna and only the transmitting module and the destination node D is equipped with one antenna and only the receiving module. Therefore, both the source node S and the destination node D can only operate in the half-duplex state. It is assumed that the relay node is equipped with two antennas, each equipped with a transmitting module and a receiving module, and is capable of operating in full-duplex mode, i.e.: and simultaneously transmitting and receiving signals at the same frequency.
Full duplex mode: when the system works in a full duplex mode, two antennas Ant-1 and Ant-2 of the relay node are respectively connected with the receiving and sending modules. What modules are specific to each antenna will be explained below. After the connection is completed, the relay node receives the information from the source node S, decodes the information and immediately forwards the information to the destination node D without waiting for the next time slot.
Half-duplex mode: when the system works in a half-duplex mode, the relay nodes are respectively connected to the receiving module and the transmitting module at the same time. In this mode, one slot in the system is divided into two sub-slots. And in the 1 st sub-time slot, two antennas are connected to the receiving module to receive the information from the source node, and in the 2 nd sub-time slot, two antennas are simultaneously connected to the transmitting module to forward the decoded information to the destination node D.
The method for realizing full-duplex half-duplex hybrid relay based on diversity gain provided by the invention comprises the following steps:
step S1: the system estimates h through the existing channel estimation algorithm1,1，h1,2，h2,1，h2,2，hsiAnd the intensity of the noise σ2。h1,1，h1,2，h2,1，h2,2Respectively representing a channel coefficient from a source node S to an antenna Ant-1 of a relay node R, a channel coefficient from the source node S to an antenna Ant-2 of the relay node R, a channel coefficient from the antenna Ant-1 of the relay node R to a destination node, and a channel coefficient from the antenna Ant-2 of the relay node R to the destination node; at the same time, the source node S sends its own system parameter P by using the control channelSTo the relay node. (in the present invention, it is assumed that the relay node is the entire systemThe control node of).
Step S2: the relay node obtains h according to the known informationmin,1＝min{h1,1,h2,2}，hmin,2＝min{h1,2,h2,1}. Compare | hmin,1I and | hmin,2The size of |. When | hmin,1|＜|hmin,2Sending a signal by adopting Ant-1 in a full duplex mode, and receiving the signal by Ant-2; when | hmin,1|＞|hmin,2And in the process of |, an antenna Ant-1 is adopted to receive signals, and Ant-2 sends signals.
Step S3: after the receiving and sending functions corresponding to each antenna are determined, the relay node calculates the signal to interference plus noise ratio (SINR) of different links according to the obtained parameters
Figure BDA0001102224330000081
γs,d＝PS|hsd|2/σ2
In the formula: gamma rayf,rRepresenting the signal-to-interference-and-noise ratio, k, of the channel between the relay node and the source node in full duplex modeRRepresents the self-interference elimination capability of the full-duplex relay node, sigma represents the standard deviation of Gaussian noise suffered by the system, and gamma represents the self-interference elimination capability of the full-duplex relay nodef,dRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the relay node and the destination node in full duplex modes,dRepresenting the signal-to-interference-and-noise ratio, h, of the channel between the source node and the destination nodesdRepresenting the channel coefficient between a source node and a destination node of the system; h is1Representing the channel coefficient, h, between the source node S and the relay node after the full-duplex transceiving antenna is selected2Representing the channel coefficient between the relay node R and the destination node D after the full-duplex transceiving antenna is selected.
Step S4: then, calculating the system SINR of the system under the full duplex mode amplification forwarding protocol and the decoding forwarding protocol:
Figure BDA0001102224330000082
γFDindicating amplify-and-forward protocol and decode-and-forward in full duplex modeSignal-to-noise ratio of the system under the protocol.
Step S5: calculating the system capacity C of the system in the full duplex mode according to the resultfd；
Cfd＝log2(1+γFD)
Step S6: the relay node calculates link signal-to-interference ratio in a half-duplex mode when working by adopting Maximum Ratio Combining (MRC) and Maximum Ratio Transmission (MRT) technologies according to the estimated channel state information:
Figure BDA0001102224330000091
γs,d＝PS|hsd|2/σ2
in the formula: gamma rayh,rRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the source node and the relay node in half-duplex modeh,dRepresenting the signal-to-interference-and-noise ratio, h, of the channel between the relay node and the destination node in half-duplex modesdRepresenting the channel coefficients between the source node S and the destination node.
Step S7: the relay node calculates the system SINR gamma under the amplifying forwarding protocol and the decoding forwarding protocol in the half-duplex modeHDThe calculation formula is as follows:
Figure BDA0001102224330000092
step S8: calculating achievable capacity C in half-duplex mode based on the above resultsHDThe calculation formula is as follows:
Figure BDA0001102224330000093
step S9: selecting an optimal working mode based on the instantaneous spectrum efficiency, which comprises the following steps: when C is presentFD＞CHDWhen the relay node works in a full duplex mode, the relay node works in a full duplex modeFD＜CHDAnd when the relay node works in the half-duplex mode, the relay node works in the half-duplex mode.
In the above steps, if the source is assumedIf the direct link between the node and the destination node does not exist, then gamma is sets,dIt is sufficient to set 0.
Full-duplex one-way relay system as shown in fig. 5, a half-duplex source node sends information to a destination node with the help of a full-duplex relay node. It is assumed that there may be a direct link between the source node S and the destination node. Since the relay node has the capability of full-duplex transmission and half-duplex transmission, in order to maximize the information transmission rate from the source node to the destination node, it is an important problem to design a reasonable and effective hybrid duplex mechanism. The method comprises the following specific implementation steps:
step A1: the system firstly adopts the prior art to carry out the steps of channel estimation, signaling control, parameter transmission and the like.
Step A2: the relay node sets the transmission rate C under the full-duplex mode and the half-duplex mode according to the acquired channel state information and system parameters (including transmission power, noise level, residual self-interference level and the like)HD，CFDAnd (6) performing calculation.
Step A3: to maximize the transmission rate, the relay node compares CHD，CFDAnd selects the mode with the higher transmission rate, working according to the hybrid duplex mechanism we propose, namely: in a half-duplex mode, both the two antennas are simultaneously connected to a receiving module or a sending module for receiving and forwarding information; under the full duplex mode, two antennas are respectively connected with the receiving module and the sending module according to a selection mechanism, and simultaneous same-frequency transmission is realized.
Based on the above mechanism, the information transmission speed from the source node S to the destination node D can be maximized. It should be noted that the method provided by the present invention, although designed under a relay system, can be easily extended to other communication systems, such as a cellular network system, or a WIFI system.
The realization method of the invention can fully utilize system resources and introduce multi-antenna diversity gain. The hybrid duplex mechanism adopted by the invention can effectively improve the system capacity, and the performance of the hybrid duplex system is limited by the performance of a half-duplex system. The mechanism can effectively improve the transmission rate of the half-duplex system, which is equivalent to improving the lower bound of the rate of the system, thereby improving the system capacity.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (8)

1. A full-duplex half-duplex hybrid relay implementation method based on diversity gain is characterized by comprising the following steps:
step 1: estimating channel state information;
step 2: selecting a receiving and transmitting mode of an antenna according to an antenna selection mechanism;
and step 3: calculating the signal-to-interference-and-noise ratios of different links according to the obtained parameters;
and 4, step 4: calculating the system signal-to-interference-and-noise ratio under the full-duplex mode amplification forwarding protocol and the decoding forwarding protocol;
and 5: calculating System Capacity C in full Duplex modefd；
Step 6: calculating link signal-to-interference ratio in a half-duplex mode when maximum ratio combining MRC and maximum ratio transmission MRT technologies work according to estimated channel state information;
and 7: calculating system signal-to-interference-and-noise ratio gamma under amplifying forwarding protocol and decoding forwarding protocol in half-duplex modeHD；
And 8: calculating achievable capacity C in half-duplex modeHD；
And step 9: selecting a mode of operation based on instantaneous spectral efficiency;
the step 1 comprises the following steps: estimate h1,1，h1,2，h2,1，h2,2And the intensity of the noise σ2Wherein: h is1,1，h1,2，h2,1，h2,2Antennas A representing respectively the source node S to the relay node RA channel coefficient from nt-1, a channel coefficient from a source node S to an antenna Ant-2 of a relay node R, a channel coefficient from the antenna Ant-1 of the relay node R to a destination node, and a channel coefficient from the antenna Ant-2 of the relay node R to the destination node; at the same time, the source node S sends its own system parameter P by using the control channelSThe relay node R sends the system parameter P of the relay node R to the relay nodeRThe destination node is given;
the step 2 comprises the following steps: the relay node obtains h according to the known informationmin,1＝min{h1,1,h2,2}，hmin,2＝min{h1,2,h2,1And compare | hmin,1I and | hmin,2The size of |;
when | hmin,1|≤|hmin,2Sending a signal by adopting Ant-1 in a full duplex mode, and receiving the signal by Ant-2; when | hmin,1|≥|hmin,2An antenna Ant-1 is adopted to receive signals in |, and Ant-2 sends signals; i.e. | hmin,1|＝|hmin,2If | this is the case, the transmission/reception mode of the antenna can be arbitrarily selected.
2. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain according to claim 1, wherein the formula for calculating the signal to interference plus noise ratios of different links in step 3 is as follows:
Figure FDA0002358356660000011
γs,d＝PS|hsd|2/σ2
in the formula: gamma rayf,rRepresenting the signal-to-interference-and-noise ratio, k, of the channel between the relay node and the source node in full duplex modeRRepresents the self-interference elimination capability of the full-duplex relay node, sigma represents the standard deviation of Gaussian noise suffered by the system, and gamma represents the self-interference elimination capability of the full-duplex relay nodef,dRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the relay node and the destination node in full duplex modes,dRepresenting the signal-to-interference-and-noise ratio, h, of the channel between the source node and the destination nodesdRepresenting the channel coefficient between a source node and a destination node of the system; h is1Representing full duplex transmit and receive antennasChannel coefficient, h, between source node S and relay node after line selection2Representing the channel coefficient between the relay node R and the destination node D after the full-duplex transceiving antenna is selected.
3. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain according to claim 1, wherein the system snr under the full-duplex mode amplify-and-forward protocol and decode-and-forward protocol in step 4 is calculated as follows:
Figure FDA0002358356660000021
in the formula: gamma rayFDThe signal-to-noise ratio of the system under the full-duplex mode amplification forwarding protocol and the decoding forwarding protocol is represented, AF represents the amplification forwarding protocol, and DF represents the decoding forwarding protocol;
γf,rrepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the relay node and the source node in full duplex modef,dRepresenting the signal-to-interference-and-noise ratio of the channel between the relay node and the destination node in full duplex mode.
4. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain according to claim 1, wherein the system capacity C in step 5fdThe calculation formula of (a) is as follows:
Cfd＝log2(1+γFD)，γFDrepresenting the signal-to-noise ratio of the system under the full-duplex mode amplify-and-forward protocol and decode-and-forward protocol.
5. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain according to claim 1, wherein the link signal-to-interference ratio in half-duplex mode in step 6 is calculated as follows:
Figure FDA0002358356660000022
γs,d＝PS|hsd|2/σ2
in the formula: gamma rayh,rRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the source node and the relay node in half-duplex modeh,dRepresenting the signal-to-interference-and-noise ratio, h, of the channel between the relay node and the destination node in half-duplex modesdRepresents the channel coefficient between the source node S and the destination node, sigma represents the standard deviation of the Gaussian noise received by the system, gammas,dRepresenting the signal to interference plus noise ratio of the channel between the source node and the destination node.
6. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain according to claim 1, wherein the system signal to interference plus noise ratio γ in step 7HDThe calculation formula of (a) is as follows:
Figure FDA0002358356660000031
wherein, γs,dRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the source node and the destination nodef,rRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the relay node and the source node in full duplex modeh,rRepresenting the signal-to-interference-and-noise ratio, gamma, of the channel between the source node and the relay node in half-duplex modeh,dRepresenting the signal-to-interference-and-noise ratio of the channel between the relay node and the destination node in half duplex mode.
7. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain of claim 1, wherein the reachable capacity C in half-duplex mode in step 8 isHDThe calculation formula of (a) is as follows:
Figure FDA0002358356660000032
wherein, γHDThe signal-to-interference-and-noise ratio of the system under the amplifying forwarding protocol and the decoding forwarding protocol in the half-duplex mode is shown.
8. The method for implementing full-duplex and half-duplex hybrid relay based on diversity gain according to claim 1, wherein the step 9 comprises: the best mode of operation is selected based on instantaneous spectral efficiency,
specifically, the method comprises the following steps: when C is presentFD＞CHDWhen the relay node works in the full duplex mode, the relay node works in the full duplex mode; when C is presentFD＜CHDWhen the relay node works in the half-duplex mode, the relay node works in the half-duplex mode; when C is presentFD＝CHDWhen the relay node works in a full duplex mode or a half duplex mode, CFDRepresenting the maximum transmission rate that can be achieved per hertz of channel bandwidth in full duplex mode.
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